Enhance update_style_attr function to support HTML color

Author: PierreRaybaut

plotpy/styles/base.py

@@ -168,10 +168,15 @@ def style_generator(color_keys="bgrcmykG"):
                 yield color + linestyle
 
 
-def update_style_attr(style, param):
-    """Parse a MATLAB-like style string and
-    update the color, linestyle, marker attributes of the param
-    object
+def update_style_attr(style: str, param) -> None:
+    """Parse a MATLAB-like style string.
+
+    Example: 'r--o' for red dashed line with circle markers
+
+    Also accepts HTML colors like '#ff0000'.
+
+    Args:
+        style: style string
     """
     for marker in list(MARKERS.keys()):
         if marker in style:
@@ -185,12 +190,18 @@ def update_style_attr(style, param):
             break
     else:
         param.line.style = "NoPen"
-    for color in list(COLORS.keys()):
-        if color in style:
-            param.line.color = COLORS[color]
-            param.symbol.facecolor = COLORS[color]
-            param.symbol.edgecolor = COLORS[color]
+    color = "black"
+    for style_str in style:
+        if style_str.startswith("#"):  # HTML color
+            color = style_str[:7]
+            break
+    for color_letter in list(COLORS.keys()):
+        if color_letter in style:
+            color = COLORS[color_letter]
             break
+    param.line.color = color
+    param.symbol.facecolor = color
+    param.symbol.edgecolor = color
 
 
 class ItemParameters: